Beer R F, Given J D, Dewald J P
Rehabilitation Institute of Chicago, and Department of Physical Medicine and Rehabilitation, Northwestern University, IL 60611, USA.
Arch Phys Med Rehabil. 1999 Jul;80(7):766-72. doi: 10.1016/s0003-9993(99)90225-3.
To investigate the task dependence of elbow weakness in patients with hemiparesis.
Descriptive study based on interlimb comparisons of maximum voluntary torques (MVTs) generated isometrically in elbow flexion and extension under four task conditions: without explicit control of the torques at adjacent joints and in combination with each of three submaximal shoulder abduction/adduction torque levels.
Rehabilitation center research laboratory.
Volunteer samples of six patients with chronic hemiparesis and four controls.
Residual strength (RS), defined as the ratio of MVTs for the paretic and nonparetic limbs of patients and nondominant and dominant limbs of controls.
For the patient group a significant effect of task condition on RS was found (analysis of variance, p = .0003 and p = .002 for elbow flexion and extension, respectively). With increasing shoulder abduction torque level, elbow flexion RS increased and elbow extension RS decreased. In contrast, for the control group, the effect of task condition on RS was not significant.
In hemiparetic patients, weakness of the paretic elbow musculature shows a strong task dependence. This task dependence likely reflects the existence of abnormal synergies between elbow and shoulder muscles of the paretic limb and has important implications for the rehabilitation of motor function following hemiparesis.
研究偏瘫患者肘部无力的任务依赖性。
基于在四种任务条件下等长收缩产生的最大自主扭矩（MVT）进行双侧比较的描述性研究，这四种任务条件分别为：不明确控制相邻关节的扭矩，以及结合三种次最大肩部外展/内收扭矩水平中的每一种。
康复中心研究实验室。
六名慢性偏瘫患者和四名对照者的志愿者样本。
残余力量（RS），定义为患者患侧与健侧肢体以及对照者非优势与优势肢体的MVT比值。
对于患者组，发现任务条件对RS有显著影响（方差分析，肘部屈曲和伸展时p值分别为0.0003和0.002）。随着肩部外展扭矩水平的增加，肘部屈曲RS增加，肘部伸展RS降低。相比之下，对于对照组，任务条件对RS的影响不显著。
在偏瘫患者中，患侧肘部肌肉无力表现出强烈的任务依赖性。这种任务依赖性可能反映了患侧肢体肘部和肩部肌肉之间存在异常协同作用，并且对偏瘫后运动功能的康复具有重要意义。
